Vehicle Steering - FISCHER Profi Cartech Manual Del Usuario

GB+USA
Task:
What are the transmission relations in the forward and reverse gears
calculated from the output shaft of the engine?
Solution:
Forward gear (faster):
20 15 20
* * =
10 20 15 3000

4. Vehicle Steering

Something has been missing in the models up to now, which is absolutely
necessary for a vehicle: the steering. Is there any vehicle that just goes
straight? Even before cars existed, carriages and wagons were already
equipped with steering. This steering was of a very simple design as in the
following model.
Model: Pivot-Support Steering
(see the assembly instructions on page 24)
In pivot-support steering, the complete front axle is mounted on a board or
a round plate and attached to the vehicle so that it can be turned. Conse-
quently, the complete front axle can be moved around the pivotal center,
and the vehicle can be steered in this way. Because both wheels travel dif-
ferent distances in curves, the wheels must be mounted so that they can ro-
tate freely on the axle. This allows them to rotate at different speeds.
14
Reverse gear (slower):
6000 2
20 15 20 6000
= * * =
1 10 20 10 2000
Task 1:
Which wheel moves the greater distance in a curve: the outside wheel
or the inside one?
Which wheel rotates faster?
Try it out on the model!
Solution:
The outer wheel travels the greater distance, because it moves over a
greater circle. Because it travels the greater distance, it also rotates
more quickly.
Task 2:
Which disadvantages did you notice in trying out the pivot-support
steering on the model?
Solution:
The wheels need a lot of space when they incline during turning.
The vehicle can tip easily in sharp curves, especially when it is going
3 fast.
=
1
Task 3:
Which vehicles use pivot-support steering today?
Solution:
Trailers and handcarts, for example.
Model: Steering Knuckle
(see the assembly instructions on page 26)
As engines became increasingly powerful and consequently cars faster, auto-
motive engineers had to come up with improved steering too. The result was
a steering knuckle, as it is found in our model.
In this type of steering, each wheel is mounted on a very short axle, called
a steering knuckle. This steering knuckle is mounted on a steering knuckle
pin in such a way that it can be turned.